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Pdf51da2bb9237.Pdf FAO, F PEER-REVIEWED REVIEW ARTICLE bioresources.com Understanding the Effect of Machine Technology and Cellulosic Fibers on Tissue Properties – A Review Tiago de Assis,a Lee W. Reisinger,b Lokendra Pal,a Joel Pawlak,a Hasan Jameel,a and Ronalds W. Gonzalez a,* Hygiene tissue paper properties are a function of fiber type, chemical additives, and machine technology. This review presents a comprehensive and systematic discussion about the effects of the type of fiber and machine technology on tissue properties. Advanced technologies, such as through-air drying, produce tissue with high bulk, softness, and absorbency. Conventional technologies, where wet pressing is used to partially dewater the paper web, produces tissue with higher density, lower absorbency, and softness. Different fiber types coming from various pulping and recycling processes are used for tissue manufacturing. Softwoods are mainly used as a source of reinforcement, while hardwoods provide softness and a velvet type surface feel. Non- wood biomass may have properties similar to hardwoods and/or softwoods, depending on the species. Mechanical pulps having stiffer fibers result in bulkier papers. Chemical pulps have flexible fibers resulting in better bonding ability and softness. Virgin fibers are more flexible and produce stronger and softer tissue. Recycled fibers are stiffer with lower bonding ability, yielding products that are weaker and less soft. Mild mechanical refining is used to improve limitations found in recycled fibers and to develop properties in virgin fibers. At the same time that refining increases strength, it also decreases bulk and water absorbency. Keywords: Tissue paper properties; Softness; Water absorbency; Wet strength; Dry strength; Tissue machine technology; Cellulosic fibers; Mechanical refining Contact Information: a: Department of Forest Biomaterials Science and Engineering, Box 8005, North Carolina State University, Raleigh, NC 27695-8005, USA; b: ReiTech Incorporated, 26 The Point, Coronado, CA, 92118, USA; *Corresponding Author: [email protected] INTRODUCTION Hygiene tissue paper products are manufactured to meet the desired performance according to a specific application inside a market segment. Overall, water absorbency, softness, strength (dry or wet), and disintegration are the most important properties used to evaluate the performance of tissue products. The observed properties of commercial tissue products are basically a function of fibers, chemistry, and manufacturing technology. There is a vast number of fiber types, tissue machine technologies, and chemical additives available in market for manufacturing of tissue products. Inside this complex environment, tissue paper manufacturers have to choose the right combination of fibers, additives, and technologies to produce specific tissue products capable of achieving the desired performance while providing enough profitability to the producer. Motivated by the complexity of this task, the main objective of this review is to present a discussion about how tissue paper properties can be tuned as a function of fiber type and tissue machine technology. This review brings a comprehensive description about a) tissue products, de Assis et al. (2018). “Tissue property development,” BioResources 13(2), 4593-4629. 4593 PEER-REVIEWED REVIEW ARTICLE bioresources.com grades, and their properties, b) a comparison of product performance from different tissue machine technologies, c) properties of different type of fibers, and d) the effect of mechanical refining on tissue properties. Even though chemical additives (e.g. softeners, surfactants, strength additives) are commonly used in tissue manufacturing to improve tissue properties, this article will not cover this topic. Information about the use of chemical additives in tissue manufacturing can be found elsewhere (Neal 1990; Forbess 1997). Tissue Paper Definitions, Products, Market and Grades Based on their function, paper products can be placed in three main categories: i) packaging - defined as packaging materials, ii) printing and writing - defined as graphic papers, and iii) wiping and absorbing - defined as household and sanitary papers. Products in the third category, also known as tissue and hygienic papers, have a wide range of types and applications, including facial tissue, toilet tissue, napkin, kitchen towel, hand towel, and wipes. Some tissue papers are also used in the manufacturing of baby napkins and sanitary towels (Hubbe 2006; Kilby and Crevecoeur 2014; FAO 2017a). Nowadays, tissue paper, together with packaging products, are the most promising sectors in the paper industry due to the constant increase in demand. The global production of tissue paper has been in constant growth for the past ten years (average annual growth rate is 2.6%), reaching a global production of 32.8 M tonnes with a total market value of $ 72.8 billion in 2015 (Euromonitor 2017; FAO 2017b). This diverse assortment of tissue products is commercialized in two market segments: i) Away From Home (AFH), professional or institutional segment; ii) At Home (AH), domestic or consumer tissue segment (Tprint 2011). AFH products are designed and sold for non-domestic consumption. Consumers typically use those products in workplaces, catering services, and public places (e.g. offices, industries, restaurants, arenas, hotels, malls, parks) (Wrap 2005). The customers of AFH products are institutions that buy tissue products from manufacturers or resellers and decide what products they want to buy to satisfy their customer’s (consumer) needs. Therefore, the consumption of those products, from the final consumer perspective, comes as a secondary need. In other words, if consumers want to go out to have a nice dinner, it is more likely that they would prefer to go to a restaurant that offers their favorite food than going to a place with premium napkins. On the other hand, AH products are designed for domestic consumption and are usually found at wholesalers or retailers. The consumption of those products come as the primary need for consumers. In this case, consumers will decide about what tissue product to buy based on the desired performance and price. For example, if consumers prefer to use very soft, white, and strong bath tissue, it is more likely that they would prefer to buy a premium product than a basic bath tissue, even though they would have to spend more money to satisfy their needs. Tissue products are manufactured and sold in a variety of brands that can be divided into two major groups: a) National Brands (NB) and b) Private Label Brands (PLB). NB are brands owned by the manufacturers and PLB are brands owned by wholesalers or retailers. After its appearance more than a century ago, PLB became very popular among retailers and consumers (Hyman et al. 2010). In 2015, the PLB market share in the tissue market was approximately 27% in the USA (with a growth of 9% over the last ten years in the USA) and 67% in Western Europe (Pöyry 2015). With the commercialization of PLB products, retailers have the potential to increase their overall profits. PLB products are typically purchased by retailers at prices slightly above the marginal costs (8% to 10% margin), and usually retailers spend much less on research and development, product de Assis et al. (2018). “Tissue property development,” BioResources 13(2), 4593-4629. 4594 PEER-REVIEWED REVIEW ARTICLE bioresources.com launching, selling and advertising. As a result, by commercializing PLB products, retailers would have higher gross margin and higher bargaining power when compared to NB products. Additionally, PLB products contribute to building retailer’s chain image and boosting customers’ loyalty, especially when PLB products have constant and good quality. Manufacturers can also benefit with the production of PLB products. PLB production has the potential to reduce manufacturer’s unit fixed costs via economy of scale when NB and PLB are produced together. Additionally, PLB production will reduce the participation of competitors in the market place and will increase cooperation with retailers. However, PLB production can result in losses to manufacturers due to insufficient profit and cannibalization of their own NB products. Usually, non-leading NB manufacturers benefit the most with PLB production. Typically, PLB consumers are price-sensitive and value-oriented, willing to pay less in a given product category. On the other hand, consumers that are more influenced by advertising and are less price-sensitive, relying on unquantifiable experience attributes, tend to choose NB products (Hyman et al. 2010). Table 1. Matrix of Fiber Types and Technology Used to Make a Range of AFH Tissue Products and Grades in the European Market (adapted from Wrap 2005) Tissue Grade Economy Premium Wet Dry Machine Format TAD Crepe Crepe Likely Recycled 100% 50%-100% 50%-100% 40%-80% < 20% Recycled Content Fiber Possible Content Recycled 100% 100% 100% 100% 50%-70% Content Toilet Tissue usually, 100% >60% 20% - 100% (rolls and recycled recycled recycled packs) Hand Towels usually > usually, 100% Usually, 100% Very limited 80% (folded and recycled recycled available recycled Paper rolled) Application Max 60% 40% - 100% <60% recycled, Facial Tissue recycled recycled often 0% Napkins and 80% - 100% 80% - 100% as found in as found in 0% - 80% Serviettes fast food retail fast food retail Most common paper type used for this application/product Some products will fall into this grade Rarely used As a function of fiber properties,
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